What Is Just-In-Time (JIT) Inventory?
JIT is an inventory strategy where stock arrives exactly when needed, minimising holding costs. It requires precise demand forecasting and reliable suppliers.
Key Takeaways
- JIT aims to receive inventory only when it's needed — minimising holding costs and working capital.
- It requires accurate demand forecasting, short and reliable lead times, and dependable suppliers.
- JIT increases supply chain risk — any disruption immediately causes a stockout.
What JIT is
Just-In-Time inventory is a management philosophy originating in Japanese manufacturing (Toyota Production System) that aims to minimise inventory holding by receiving goods only when they are actually needed in the production or sales process. The goal is near-zero inventory: no stock sitting in a warehouse, maximum working capital efficiency.
Benefits of JIT
Dramatically lower inventory holding costs. Reduced warehouse space requirements. Lower working capital tied up in stock. Reduced risk of obsolescence or spoilage. Forces discipline in demand forecasting and supplier relationship management. In manufacturing, it exposes production inefficiencies that excess buffer stock was hiding.
Requirements for JIT to work
JIT requires: accurate and stable demand forecasting (unpredictable demand spikes cannot be absorbed without buffer stock). Very short and reliable lead times from suppliers. Multiple local or near-shore supplier options. Excellent supplier relationships with strong contractual commitments. High-quality forecasting systems. These requirements are demanding — JIT works best in mature, stable supply chains.
JIT and supply chain resilience
COVID-19 exposed the fragility of extreme JIT approaches. Businesses with no buffer stock faced immediate stockouts when any part of the supply chain was disrupted. Most businesses now run a modified JIT approach: minimising holding of fast-moving products while maintaining safety stock buffers, especially for long lead time or single-sourced products.